Understanding the partial discharge activity of conducting particles in GIS under DC voltages using the UHF technique

Abstract

SUMMARYThe major cause of failure of DC-GIS is due to presence of foreign particles causing partial discharges in the insulation structure. The particle movement in gas insulated system (GIS) radiates electromagnetic waves and the bandwidth of the signal lies in the range 1-2 GHz. Increase in applied DC voltage/pressure has not altered the frequency content of the ultra high frequency (UHF) signal generated due to partial discharge formed by particle movement. The UHF sensor could recognize the breakdown of sulfur-hexa-fluoride (SF 6 ) gas under DC and Lightning impulse voltages and the frequency content of the signal captured by the UHF sensor lies up to 500 MHz. Mounting UHF sensor in GIS could allow one to classify internal partial discharges from breakdown, at the time of testing/during operation.

Adsorption and Sensing for SF6 Decomposition Products by Ru–MoTe2 Monolayer

“…[8][9][10] However, insulation defects inevitably occur in the preparation, installation, and operation of GIS equipment. [11,12] Thus, SF 6 gas will decompose to various low-fluorine SF x (x ¼ 1%5) under the overheating, impulse voltage, and partial discharge. [13,14] In the presence of trace air and water vapor, various final decomposition products of SF 6 will be generated, including SO 2 , SOF 2 , and SO 2 F 2 .…”

An Uwb Printed Antenna for Partial Discharge Uhf Detection in High Voltage Switchgears

“…Currently, different UHF antennas, which can be classified as external and built-in, are used for PD detection in transformers, gas-insulation switches (GIS), wind power devices, power cable and etc. [11][12][13][14][15][16][17][18][19][20]. However, the study on the UHF antenna for PD detection application in the high voltage switchgear is not enough, and those previous antennas either have narrow operating bandwidths or have low gain.…”

Long Wire Antenna-Like Behavior of Uninsulated Overhead Distribution Cables

“…It has been shown that the magnitude of a PD pulse can be related to the charge inside a cavity fault and the voltage across the insulator [1]. Previous research shows that this PD pulse consists of a broad band range of frequencies, even up to the GHz region [2][3][4]. The UHF components generated by PD activity is currently used to detect and locate faults in HV transformers and Gas Insulated Substations [5][6][7].…”